Studies on the magnetic and structural phase transitions of Nd₃RuO₇

Abstract

Crystal structures and magnetic and thermal properties of neodymium ruthenate Nd 3 RuO 7 have been investigated. The specific heat and neutron diffraction measurements showed a monoclinic-orthorhombic structural phase transition at 130 K. The monoclinic crystal structure at 100 K is well described with the space group P2 1 /m (a = 10.8893(4) Å, b = 7.3864(2) Å, c = 7.4731(2) Å and β = 90.008(6) • ). The results of the magnetic susceptibility measurements show the existence of the antiferromagnetic transition with a weak ferromagnetic component at 19 K. Specific heat and neutron diffraction measurements also indicated long-range magnetic ordering of both Nd 3+ and Ru 5+ ions below 19 K. The magnetic sublattice of Nd 3+ ions was twice as large as the size of the crystal lattice along the b-axis. On the other hand, the size of the magnetic sublattice of Ru 5+ was the same as that of the crystal lattice. Ru 5+ ions were coupled anti-ferromagnetically along the c-axis.

High-temperature X-ray diffraction measurements of fluorite-related rare earth antimonates Ln3SbO7 (Ln=Nd, Tb) and their magnetic properties

“…These octahedra share corners forming one-dimensional chains which are oriented along the c-axis. The same space group Cmcm has been applied for Ln 3 RuO 7 (Ln = La ~ Gd) [2][3][4][5][6][7][8][9][10][11][12][13], 6 (ZFC) and field-cooled (FC) conditions. The former was measured upon heating the sample to 400 K under the applied magnetic field of 0.1 T after zero-field cooling to 1.8 K. The latter was measured upon cooling the sample from 400 to 1.8 K at 0.1 T.…”

Magnetic properties of orthorhombic fluorite-related oxides Ln3SbO7 (Ln=rare earths)

“…Due to this unique crystal structures and possible related magnetic properties, many studies have been performed, especially for the magnetic properties of compounds containing Ru 5+ ion at the M-site because of its largest possible spin (S = 3/2) [3][4][5][6][7][8][9][10][11][12][13].…”

Thermal and magnetic properties of the spin-chain materialPr3RuO7

“…In this paper, we report our experimental investigation of the magnetic and calorimetric properties of high-quality single-crystals of Pr 3 RuO 7 . This compound belongs to a class of ruthenates with formula Ln 3 RuO 7 (Ln for lanthanides) with fluorite-related phases, either crystallizing in the Cmcm space group of the orthorhombic system or in a disordered fluoritephase, depending on the size of the Ln cations relative to pentavalent cation Ru [1][2][3][4] .…”